package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书：");
        String name = scanner.nextLine();

        int pos = -1;

        int currentSize = bookList.getUsedSize();
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getBooks(i);
            if (book.getName().equals(name)){
                pos = i;
                System.out.println("删除成功！");
                break;
            }
        }
        
        if (i == currentSize){
            System.out.println("没有你要删除的图书！");
            return;
        }

        int j = pos;
        for (; j < currentSize-1; j++) {
            Book book = bookList.getBooks(j+1);
            bookList.setBooks(j,book);
        }

        bookList.setBooks(j,null);

        bookList.setUsedSize(currentSize-1);
    }
}
